Convert annotation formats

How To Convert Supervisely JSON to YOLO Keras TXT

In this guide, we show you how to convert data between the Supervise.ly and YOLO Keras formats for free. You can use your converted data to train YOLOv3 Keras models and other models that support the YOLO Keras format.

Supervisely JSON

Supervise.ly offers a computer vision platform and uses a proprietary JSON-based annotation format.

Below, learn the structure of Supervisely JSON.

img0001.jsonJSON
{
    "description": "",
    "tags": [
        {
            "id": 12345,
            "name": "train",
            "value": null,
            "labelerLogin": "roboflow",
            "createdAt": "2000-01-01T00:00:00.000Z",
            "updatedAt": "2000-01-01T00:00:00.000Z"
        }
    ],
    "size": {
        "height": 191,
        "width": 264
    },
    "objects": [
        {
            "id": 12345,
            "classId": 67890,
            "description": "",
            "geometryType": "polygon",
            "labelerLogin": "roboflow",
            "createdAt": "2000-01-01T00:00:00.000Z",
            "updatedAt": "2000-01-01T00:00:00.000Z",
            "tags": [],
            "classTitle": "helmet",
            "points": {
                "exterior": [
                    [
                        184,
                        30
                    ],
                    [
                        259,
                        30
                    ],
                    [
                        260,
                        134
                    ],
                    [
                        185,
                        131
                    ]
                ],
                "interior": []
            }
        },
        {
            "id": 12346,
            "classId": 67891,
            "description": "",
            "geometryType": "rectangle",
            "labelerLogin": "roboflow",
            "createdAt": "2000-01-01T00:00:00.000Z",
            "updatedAt": "2000-01-01T00:00:00.000Z",
            "tags": [],
            "classTitle": "person",
            "points": {
                "exterior": [
                    [
                        63,
                        49
                    ],
                    [
                        124,
                        62
                    ]
                ],
                "interior": []
            }
        }
    ]
}

YOLO Keras TXT

A format used with the Keras implementation of YOLOv3.

Below, learn the structure of YOLO Keras TXT.

yolokeras.annotations.txt
000001.jpg 178,84,230,143,1 111,144,134,174,1
000007.jpg 280,127,337,208,1 8,125,86,235,1 115,139,180,230,1 375,152,410,219,1 412,148,474,233,1 336,148,387,223,1 247,124,294,203,1 197,177,231,227,1 174,156,201,219,1 477,143,499,223,1
000012.jpg 75,20,174,128,1 284,131,303,155,1 381,189,407,215,1 242,32,258,55,1
000013.jpg 0,100,176,331,1
000014.jpg 437,174,487,233,1 326,184,379,248,1 228,249,310,352,1 372,120,402,169,1 326,137,364,185,1
000016.jpg 129,28,239,140,1
000017.jpg 150,102,184,144,1
000018.jpg 128,38,149,61,1
000019.jpg 254,70,283,107,0 107,71,137,101,0 181,66,215,111,0 145,66,174,104,0 303,61,349,121,0
000020.jpg 95,32,123,65,1 149,93,176,120,1
yolokeras.classes.txt
head
helmet
person

Step 1: Create a free Roboflow account

Roboflow is a universal conversion tool for computer vision annotation formats. To convert your dataset, start by creating a free Roboflow account.

Create free Roboflow account

Step 2: Upload your data into Roboflow

Once your account has been created, click Create New Project. (opens in a new tab)

Roboflow's create project form, with Object Detection selected as the project type

Upload your data to Roboflow by dragging and dropping your Supervisely JSON images and annotations into the upload space.

Roboflow's upload page, with a drag-and-drop area for images, annotations, videos and PDFs

Step 3: Generate Dataset Version

Next, click "Generate New Version" to generate a new version of your dataset:

Roboflow's Generate a Dataset Version page, showing the source images and train/test split for a new version

You can then apply any preprocessing or augmentation steps to your dataset:

The augmentation step of a new dataset version, with 90° Rotate and Brightness added

Step 4: Export Dataset Version

After generating, you will be prompted to Export your dataset. You can choose to receive your dataset as a .zip file or a curl download link. Choose YOLO Keras TXT when asked in what format you want to export your data. You will see a dropdown with various options like this:

Roboflow's Download dialog, with the export format list open and COCO highlighted

Congratulations, you have successfully converted your dataset from Supervisely JSON format to YOLO Keras TXT format!

Video Tutorial

Convert Computer Vision Annotation Formats Tutorial

Want to dive deeper into converting annotation formats with Roboflow? In the tutorial below, we explore how to convert your data in the Roboflow dashboard. We also discuss rejecting annotations and train-test-validation splits.

Add the Roboflow MCP to your coding agent

Connect your agent

Frequently Asked Questions

Yes! It is free to convert Supervisely JSON data into the YOLO Keras TXT format on the Roboflow platform.

If you have between a few and a few thousand images, converting data between these formats will be quick. But, the time it takes to convert between data formats increases with the more images you have.

Show guide

Convert Supervisely JSON to other formats

Convert other formats to YOLO Keras TXT

Start where you are

Speak with an AI expert

Our team will help you start solving business problems on the first call.

  • Solution architecting
  • Live demonstration
  • Pricing and specifications
  • Feasibility assessment

Over 80,000 organizations build with Roboflow.

Rivian
Pella
Chobani
USG Corporation
BNSF Railway
American Woodmark
Outcomes
Patrick Industries
Peer Robotics
Create free Roboflow account